Hoist or lifting mechanism



FeB. 10, 1931.

H. L. CAMPBELL HOIST OR LIFTING MECHANISM Filed Dec. 26, 1929 3 Sheets-Sheet l gwuantoz Feb. 10, 1.931. I L, CAMPBELL 1,792,359

HOIST OR LIFTING MECHANISM Filed Dec. 26, 1929 3 Sheets-Sheet 2 amen cox Feb. 10, 1931. L, CAMPBELL 1,792,359

HOIST OR LIFTING MEQHANISM Filed Dec. 26, 1929 3 Sheets-Sheet 3 Patented Feb. '10, 1931 UNITED smrs HORACE L. CAMPBELL, OF ST. LOUIS, MISSOURI ags-v HOIST on LIZFZEING MECHANISM:

Application filed December 2t, 1929. Serial No. 416,374.

nism which may be readily brought into en-' gagement with the object to be liftedto hold the same securely while it is being raised or movedby the hoist. o

Another object is to provide a means for releasably attaching the. grappling mechanism to the hoist so that itmay be readily removed and replaced by a carriage for sup porting boxes, trucks or cars such as those used in removing brick from the kiln.

A further object is to;oprovide a means whereby the object being raised will be maintained in'substantially a horizontal or level position no matter what angle is assumed by the lifting arm or beam of the hoist during the process of raising or lowering the object.

The foregoing and other objects together with means whereby the same may be carried into effect will best be understood from the following description of a preferred embodiment of the invention taken in connection with. the accompanying drawing wherein: 7 '1 Figure 1 is a side view of the invention as mounted on the rear end of a truck showing the lifting arm partially elevated.

Figure 2 is a plan view of the structure shown inFigure 1.

Figure 3 is an enlarged section along the line 3-3 in Figure 2.

Figure 4 is a section along the line l 1in Figure3.

Figure 5 is an enlarged longitudinal sectional view of a carriage adapted to be mounted in the hoist for supporting boxes or kiln cars. 1 7

Referring now more particularly to the drawing, the reference character A designates therear end of a truck chassis of any conventional form, which may be provided comprising the elevating arms, 11 and 12 V which are pivoted on the hubs 10 of the said with the usual body or bed (not shown). The invention comprises 'a supporting frame formed of the two supporting uprights 1, and- 2 which are secured to the chassis A in laterally spaced relationshipby their mounting feet 3 and extend angularlyupwardly and forwardly therefrom. Bracing members it and 5 are similarly secured to the chassis forwardly of the uprights 1 and 2 by their mounting feet 6 and extend upwardly. and ad I rearwardly therefrom into engagement with the upper endsof the said uprights to which they are connected by the pulley shaft 7;as shown. Bevel gears8 and 9 are rigidly'se cured to the uprights 1 and 2 near the central portions thereof, the said gears being d ise posed on the outer faces of-the, uprights and" spaced therefrom b their hubs 10. ,An 'ele vating mechanism is provided, the. same K gears 8 and!) andlextend rearwardlyfrom. their point of attachment as shown. A cross bar 13 is secured between the arms 11 and 12 to brace the same. Cables 14 and 15v are se- 7 cured at 66 to 'the'outer or free ends of the elevating arms 11 and 12 and are trained over pulleys 16 and 17 journaledon the pulley shaft 7 the remaining ends of the cables being wound around a conventional winch drum 18 which may be rotated in any suit: able manner to raise and lower the outer ends of the elevating arms aswill be understood. It'will also be evidentthat the ends of the cables 14 and 151might .be secured to the wheels of'the truckin such manner that a forward movement of the truck wouldraise the elevating mechanism and a rearward movement lower it.

Beveled gears 19 and 20 similar to the aforesaid gears 8 and 9 are j ournaled by their stub shafts 21 in the elevating arms 11 and 12 adjacent the outer ends thereof, the said gears 19 and 20 being disposed on theouter sides of the said arms and in alignment with the gears 8 and 9. The'stub shafts 21 of the gears 19 and 20 extend through the arms 11 and12 and attaching plates 22 and 23 are rigidly secured to the inner ends of these shafts as shown. Brackets 24 and 25'are securedto W3 shown at 35.

the outer sides of the arms 11 and 12 adjacent the aforesaid beveled gears and drive shafts 26 and 27 are journaled through these brackremovably fastened near their centers to the attaching plates 22 and 23 by means of the cap screws or bolts 32. An elongated gripping cam 33 is journaled on a shaft 34 extended through the side plates30 and 31 adjacent the inner ends thereof, the said cam having longitudinal ribs or serrations as One end of the cam 33 is reduced and provided with a peripheral groove 36. An operating cable 37 has its ends secured in this groove 36 at 38 and has its bight trained over a suitable retaining element such as a roller 39 mounted between the bracing members 4 and 5. The oppositeend of the cam 33 is also reduced as at 40 and a clutch band 41 is mounted over this reduced end, the ends of said clutch band being connected to an adjusting head 42. An inwardly turned lng 43is provided on the inner end of the side plate 31 and a bolt 44 is threaded through this lug. The adjusting head 42 is slidably mounted on the bolt 44 and is normally urged away from the lug 43 into engagement with the head45 of the bolt 44 by an expansion coil spring 46 mounted as shown so that the clutch band 41 will exert a brakin action on the cam 33. The amount of this braking action may be properly adjusted to allow manual rotation of the cam without unnecessary looseness thereof by turning the bolt 44 as will be understood. A lower gripping yoke 47 is provided, the same comprising two arms 48 and 49 pivotally attached at 50 to the side plates 30 and 31 near the outer ends thereof. A rubber or similar resilient cross piece 51 is secured between the free ends of the said arms 48 and 49 and a cable 52 is secured at one end as at 53 to the end of'the arm 48 and is trained under the cam 33 and secured at 54 in the groove 36 thereof as shown. An upper yoke 55 is provided, the same comprising arms 56 and 57 pivoted at 5 8 to the side plates 30 and 31 above the pivot points 50 of the lower yoke 47 and connected by a resilient cross piece 59.as shown.

In the use of the device for lifting safes, boxesor other objects the elevating mechanism B is lowered until the object to be raised projects up between the side plates 30 and 31 and between the cam 33 and yokes 47 and 55. The safe or other object to be raised is shown in dotted lines at D in the drawing. The cable 37 is then pulled causing the cam 33 to rotate and bring its lobe or segment of greatest diameter into engagement with the object. This rotation of the cam 33 also pulls the lower yoke 47 into engagement with the other side of the object since the yoke and cam are connected by the cable52. The up per yoke 55 is then thrown over on the object as shown and it will be understood that the same is securely gripped and held so that it may be raised and moved at will by the device. The oam 33 and cable 37 are so ar-- ranged that the periphery of the cam adjacent the object moves downward to bring the lobe into engagement therewith and therefore the weight of the object will serve to hold it securely in place as will be understood. The upward and downward swinging of the elevating arms 11 and 12 as aforesaid will rotate the drive shafts 26 and 27 by the travel of the pinions 29 around the fixed beveled gears 8 and 9 thus causing the other pinions 28to rotate the beveled gears19 and 20 as will be understood. The pinions and gears are so proportioned that this rotation of the gears 19 and 20 will swing the grippin mechanism C and cause it to rest in a horizontal position at all times'no matter what angle the said elevating armsll and 12 assume. I 1 i In Figure 5 is illustrated a carriage E for supporting boxesfor small cars, a car being shown in the dotted lines 63 in this view. This carriage comprises spaced sideplates, one of which is shown at 60, which are similar to the aforesaid" side plates 30 and 31 of the gripping mechanism C. These side plates 60 are connected by cross pieces 61 upon which rails are mounted as shown at 62 so'that the car 63 may be rolled thereon as shown. Theentire gripping mechanism C as hereinbefore described may be removed from the hoist by removing the screws 32 and this carriage63 mounted in the hoist by means of the same screws as shown in the drawing. It will be obvious that by the use of either the gripping mechanism C or the carriage 63 that objects of any kind may be transported or elevated in the hoist. The

numeral 64 designates a leg hinged at 65 to the truck chassis A near the rear end there of and adapted to be let down as a support for the said chassis when raising very heavy weights in the hoist.

While I have herein set forth a certain preferred embodiment of the invention it is understood that I may vary from the same in minor structural details, so as best 'to construct a practical, device for the purposes intended, not departing from the spirit of the invention and within the scope of the appended claims;

I claim: 7

1. In a device of the kind described, a supporting frame, a pair of elevating arms pivoted to the said supporting frame, a gripping mechanism comprismg spaced side plates removably mounted between the said elevating arms, a cam journaled between the ends of the said side plates, a cable connected at its ends to the said cam and manually operable to rotate the said cam, 21 lower gripping yoke pivoted to the opposite ends of the said side plates, the said yoke including a resilient cross piece, and a cable connected between the said yoke and the cam whereby a rota- I tion of the cam will swing the said yoke inward to grip an object.

2. In a device of the kind described, a supporting frame, a pair of gears secured thereto, elevating arms pivotally connected to the said gears, a pair of gearsjournaled in the said elevating arms, attaching plates secured to the latter gears to turn therewith, a gripping mechanism detachably connected to the said attaching plate, brackets on the said elevating arms, drive shafts journaled through the said brackets, and pinions on the said drive shafts in mesh with the said gears on the supporting frame and elevating arms.

3. In a device of the kind described, a supporting frame, spaced elevating arms pivoted to the said supporting frame, means for elevating the said elevating arms, an object gripping cam rotatably mounted between the said elevating arms, means for rotating the said cam, a gripping yoke pivoted at its ends between the said elevating arms and spaced from the said cam, a resilient object gripping cross-piece secured to the gripping yoke, and a cable secured at one end to the said gripping yoke and trained over the said gripping cam whereby the said yoke will be swung towards the cam as the latter is rotated.

4:. In a device of the kind described, a supporting frame, spaced elevating arms pivoted to the supporting frame, means for raising and lowering the said elevating arms, attaching plates journaled between the said elevating arms, side plates detachably connected to the said attaching plates, cooperating leveling means mounted on the supporting frame, elevating arms and attaching plates whereby the said side plates will be maintained in a horizontal plane as the elevating arms are raised and lowered, and an object gripping mechanism operatably mounted between the said side plates.

In testimony whereof I afiix my signature.

HORACE L. CAMPBELL. 

